It's all performative. Means nothing. When you fill out FFL form, it asks you if you use illegal drugs, have mental issues, and are wanted by law enforcement, etc ... Real stupid stuff like that. I'm going to go out on a limb here and bet that no one picking up a gun admitted to being a mentally disturbed drug addict and said, "gee gun shop man, I'm stoned right now and on the run, so I better not buy this." I mean, really, cannabis users are not affected in any way if they just lie about it.